"Outside" can mean any of a thousand things. Bright? Cloudy? Shade? Full sun? Dark area towards light? Light area towards dark? Shooting an elephant? Or a piece of jewelry? Or a school class? Or a building? or, or, or, or, or...

Basically, you're going to have to assess how bright the bright stuff in your frame is. Compare that to the not as bright stuff. Figure where the sun is coming from (If the sun is even in play) then decide if you can ignore the sun (as on an enclosed fully shaded porch) or if you can BOUNCE the sun with reflectors, or if you've got to FIGHT the sun with added lighting.

That last one is pretty difficult, since the sun is VERY, VERY bright, and typically only expensive and powerful instruments such as high-wattage HMIs have the power to balance out shadows cast in open sunlight.

The place to start is to do some tests at the time and facing the same direction you're planning for your shots and look at the results paying particular attention to the shadows you get.

Cameras are NOT as sensitive as the human eye, and what your eyes and brain can capture as detail in the shadow areas like overhead sun-lit human eye sockets and shadows cast from trees, etc, nearly all cameras will see as dark, detail free black holes in your scenes.